Chalazion --------- General Information The eyelids contain numerous glands that open along the margins of the eyelids. These include the Meibomian glands (tarsal glands). Their glandular secretion helps prevent tears from flowing over the eyelid margins and also helps to keep the eyeball lubricated and moist. Sometimes the Meibomian glands become plugged, distended and inflamed, which results in a small swelling on the eyelid. This swelling is a chalazion. Important Points in Treatment Surgical correction, with the animal under general anesthesia, is often required to eliminate the chalazion. Notify the Doctor if Any of the Following Occur: * You cannot apply the prescribed medication. * Your pet shows continued signs of discomfort.